Professional Breathalyzer Keychain by Emerywood: Alcohol Tester Red Backlit Breath Analyzer Portable High-Precision Breathalyzer with LCD Display and Replacement Mouthpieces

This product did not give accurate readings. Readings stated I had .02 bac but i had nothing to drink, so my 12year old child tested it had it read that her BAC was .04, then once more at .06! Does not work.

The product works okay but I wouldn’t buy it again. You can’t trust it for an accurate reading. It measures up to 1.9% and almost always give a reading of 1.5%. If you drink water after drinking alcohol it gives you a 0.00%. Spend money on more expensive ones for accuracy because this one doesn’t work.

Doesn't measure ketones. Not it's intended function so it's not a negative.(Update 3/1/18): I was wrong!(Update 5/26/18) I no longer use anything other than this to track whether or not I'm in ketosis. Invaluable for ketogenic dieters.

Tested this after having a few beers at home. Seems to work as it should and based on how I was feeling it seemed accurate. Would use as a baseline but wouldnt hold up in court.

Very cool gadget to have handy. Many people have no idea when they are intoxicated and should not be driving, this gadget provides the proof.

Worked well the first time... Now it just does the 10 second countdown four times before starting, and only ever 0.

Mostly used for entertainment purposes. I don't think anyone should rely on this to drive. Seems fairly accurate but can be inconsistent.

registers nothing and just beeped the whole time no mater what I did.